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cbackend.cpp
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cbackend.cpp
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//===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This library converts LLVM code to C code, compilable by GCC and other C
// compilers.
//
//===----------------------------------------------------------------------===//
#include "ispc.h"
#include "module.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <sstream>
#ifndef _MSC_VER
#include <inttypes.h>
#define HAVE_PRINTF_A 1
#define ENABLE_CBE_PRINTF_A 1
#endif
#ifndef PRIx64
#define PRIx64 "llx"
#endif
#include "llvmutil.h"
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CallingConv.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/InlineAsm.h"
#else // LLVM 3.3+
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/InlineAsm.h"
#endif
#include "llvm/Pass.h"
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_6 // <= 3.6
#include "llvm/PassManager.h"
#else // LLVM 3.7+
#include "llvm/IR/LegacyPassManager.h"
#endif
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
#include "llvm/TypeFinder.h"
#else // LLVM_3_3+
#include "llvm/IR/TypeFinder.h"
#endif
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/STLExtras.h"
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_4 // 3.2, 3.3, 3.4
#include "llvm/Support/InstIterator.h"
#else // 3.5+
#include "llvm/IR/InstIterator.h"
#endif
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_5
#include "llvm/Analysis/FindUsedTypes.h"
#endif
#include "llvm/Analysis/LoopInfo.h"
#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_5
#include "llvm/IR/Verifier.h"
#include <llvm/IR/IRPrintingPasses.h>
#include "llvm/IR/CallSite.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/Support/FileSystem.h"
#else
#include "llvm/Analysis/Verifier.h"
#include <llvm/Assembly/PrintModulePass.h>
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#endif
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
//#include "llvm/Target/Mangler.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2 // 3.2
#include "llvm/DataLayout.h"
#else // LLVM 3.3+
#include "llvm/IR/DataLayout.h"
#endif
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2 // 3.2
#include "llvm/Support/InstVisitor.h"
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_3_4 // 3.3, 3.4
#include "llvm/InstVisitor.h"
#else // LLVM 3.5+
#include "llvm/IR/InstVisitor.h"
#endif
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/Host.h"
#include "llvm/Target/TargetMachine.h"
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_4 // 3.2, 3.3, 3.4
#include "llvm/Config/config.h"
#endif
#include <llvm/Transforms/IPO.h>
#include <llvm/Transforms/Utils/BasicBlockUtils.h>
#include <llvm/Support/ToolOutputFile.h>
#include <algorithm>
// Some ms header decided to define setjmp as _setjmp, undo this for this file.
#ifdef _MSC_VER
#undef setjmp
#define snprintf _snprintf
#endif
///////////////////////////////////////////////////////////////////////////////
// This part of code was in LLVM's ConstantsScanner.h,
// but it was removed in revision #232397
namespace constant_scanner {
class constant_iterator : public std::iterator<std::forward_iterator_tag,
const llvm::Constant, ptrdiff_t> {
llvm::const_inst_iterator InstI; // Method instruction iterator
unsigned OpIdx; // Operand index
bool isAtConstant() const {
assert(!InstI.atEnd() && OpIdx < InstI->getNumOperands() &&
"isAtConstant called with invalid arguments!");
return llvm::isa<llvm::Constant>(InstI->getOperand(OpIdx));
}
public:
constant_iterator(const llvm::Function *F) : InstI(llvm::inst_begin(F)), OpIdx(0) {
// Advance to first constant... if we are not already at constant or end
if (InstI != llvm::inst_end(F) && // InstI is valid?
(InstI->getNumOperands() == 0 || !isAtConstant())) // Not at constant?
operator++();
}
constant_iterator(const llvm::Function *F, bool) // end ctor
: InstI(llvm::inst_end(F)),
OpIdx(0) {}
bool operator==(const constant_iterator &x) const {
return OpIdx == x.OpIdx && InstI == x.InstI;
}
bool operator!=(const constant_iterator &x) const { return !(*this == x); }
pointer operator*() const {
assert(isAtConstant() && "Dereferenced an iterator at the end!");
return llvm::cast<llvm::Constant>(InstI->getOperand(OpIdx));
}
constant_iterator &operator++() { // Preincrement implementation
++OpIdx;
do {
unsigned NumOperands = InstI->getNumOperands();
while (OpIdx < NumOperands && !isAtConstant()) {
++OpIdx;
}
if (OpIdx < NumOperands) return *this; // Found a constant!
++InstI;
OpIdx = 0;
} while (!InstI.atEnd());
return *this; // At the end of the method
}
};
inline constant_iterator constant_begin(const llvm::Function *F) {
return constant_iterator(F);
}
inline constant_iterator constant_end(const llvm::Function *F) {
return constant_iterator(F, true);
}
}
///////////////////////////////////////////////////////////////////////////////
// FIXME:
namespace {
/// TypeFinder - Walk over a module, identifying all of the types that are
/// used by the module.
class TypeFinder {
// To avoid walking constant expressions multiple times and other IR
// objects, we keep several helper maps.
llvm::DenseSet<const llvm::Value*> VisitedConstants;
#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_6 // LLVM 3.6+
llvm::DenseSet<const llvm::Metadata*> VisitedMDNodes;
#endif
llvm::DenseSet<llvm::Type*> VisitedTypes;
std::vector<llvm::ArrayType*> &ArrayTypes;
std::vector<llvm::IntegerType*> &IntegerTypes;
std::vector<bool> &IsVolatile;
std::vector<int> &Alignment;
public:
TypeFinder(std::vector<llvm::ArrayType*> &t, std::vector<llvm::IntegerType*> &i,
std::vector<bool> &v, std::vector<int> &a)
: ArrayTypes(t), IntegerTypes(i) , IsVolatile(v), Alignment(a){}
void run(const llvm::Module &M) {
// Get types from global variables.
for (llvm::Module::const_global_iterator I = M.global_begin(),
E = M.global_end(); I != E; ++I) {
incorporateType(I->getType());
if (I->hasInitializer())
incorporateValue(I->getInitializer());
}
// Get types from aliases.
for (llvm::Module::const_alias_iterator I = M.alias_begin(),
E = M.alias_end(); I != E; ++I) {
incorporateType(I->getType());
if (const llvm::Value *Aliasee = I->getAliasee())
incorporateValue(Aliasee);
}
llvm::SmallVector<std::pair<unsigned, llvm::MDNode*>, 4> MDForInst;
// Get types from functions.
for (llvm::Module::const_iterator FI = M.begin(), E = M.end(); FI != E; ++FI) {
incorporateType(FI->getType());
for (llvm::Function::const_iterator BB = FI->begin(), E = FI->end();
BB != E;++BB)
for (llvm::BasicBlock::const_iterator II = BB->begin(),
E = BB->end(); II != E; ++II) {
const llvm::Instruction &I = *II;
// Operands of SwitchInsts changed format after 3.1
// Seems like there ought to be better way to do what we
// want here. For now, punt on SwitchInsts.
if (llvm::isa<llvm::SwitchInst>(&I)) continue;
// Incorporate the type of the instruction and all its operands.
incorporateType(I.getType());
if (llvm::isa<llvm::StoreInst>(&I))
if (llvm::IntegerType *ITy = llvm::dyn_cast<llvm::IntegerType>(I.getType())) {
IntegerTypes.push_back(ITy);
const llvm::StoreInst *St = llvm::dyn_cast<llvm::StoreInst>(&I);
IsVolatile.push_back(St->isVolatile());
Alignment.push_back(St->getAlignment());
}
if (llvm::isa<llvm::LoadInst>(&I))
if (llvm::IntegerType *ITy = llvm::dyn_cast<llvm::IntegerType>(I.getType())) {
IntegerTypes.push_back(ITy);
const llvm::LoadInst *St = llvm::dyn_cast<llvm::LoadInst>(&I);
IsVolatile.push_back(St->isVolatile());
Alignment.push_back(St->getAlignment());
}
for (llvm::User::const_op_iterator OI = I.op_begin(), OE = I.op_end();
OI != OE; ++OI)
incorporateValue(*OI);
// Incorporate types hiding in metadata.
I.getAllMetadataOtherThanDebugLoc(MDForInst);
for (unsigned i = 0, e = MDForInst.size(); i != e; ++i)
incorporateMDNode(MDForInst[i].second);
MDForInst.clear();
}
}
for (llvm::Module::const_named_metadata_iterator I = M.named_metadata_begin(),
E = M.named_metadata_end(); I != E; ++I) {
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_7 /* 3.2, 3.3, 3.4, 3.5, 3.6, 3.7 */
const llvm::NamedMDNode *NMD = I;
#else /* LLVM 3.8+ */
const llvm::NamedMDNode *NMD = &*I;
#endif
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
incorporateMDNode(NMD->getOperand(i));
}
}
private:
void incorporateType(llvm::Type *Ty) {
// Check to see if we're already visited this type.
if (!VisitedTypes.insert(Ty).second)
return;
if (llvm::ArrayType *ATy = llvm::dyn_cast<llvm::ArrayType>(Ty))
ArrayTypes.push_back(ATy);
// Recursively walk all contained types.
for (llvm::Type::subtype_iterator I = Ty->subtype_begin(),
E = Ty->subtype_end(); I != E; ++I)
incorporateType(*I);
}
/// incorporateValue - This method is used to walk operand lists finding
/// types hiding in constant expressions and other operands that won't be
/// walked in other ways. GlobalValues, basic blocks, instructions, and
/// inst operands are all explicitly enumerated.
void incorporateValue(const llvm::Value *V) {
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_5 // 3.2, 3.3, 3.4, 3.5
if (const llvm::MDNode *M = llvm::dyn_cast<llvm::MDNode>(V)) {
incorporateMDNode(M);
return;
}
#else /* LLVN 3.6+ */
if (const llvm::MetadataAsValue *MV = llvm::dyn_cast<llvm::MetadataAsValue>(V)) {
incorporateMDNode(MV->getMetadata());
return;
}
#endif
if (!llvm::isa<llvm::Constant>(V) || llvm::isa<llvm::GlobalValue>(V)) return;
// Already visited?
if (!VisitedConstants.insert(V).second)
return;
// Check this type.
incorporateType(V->getType());
// Look in operands for types.
const llvm::User *U = llvm::cast<llvm::User>(V);
for (llvm::Constant::const_op_iterator I = U->op_begin(),
E = U->op_end(); I != E;++I)
incorporateValue(*I);
}
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_5 // 3.2, 3.3, 3.4, 3.5
void incorporateMDNode(const llvm::MDNode *V) {
// Already visited?
if (!VisitedConstants.insert(V).second)
return;
// Look in operands for types.
for (unsigned i = 0, e = V->getNumOperands(); i != e; ++i)
if (llvm::Value *Op = V->getOperand(i))
incorporateValue(Op);
}
#else // LLVM 3.6+
void incorporateMDNode(const llvm::Metadata *M) {
// Already visited?
if (!VisitedMDNodes.insert(M).second)
return;
if (const llvm::MDNode* N = llvm::dyn_cast<llvm::MDNode>(M)) {
// Look in operands for types.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
if (const llvm::Metadata *O = N->getOperand(i))
incorporateMDNode(O);
} else if (llvm::isa<llvm::MDString>(M)) {
// Nothing to do with MDString.
} else if (const llvm::ValueAsMetadata* V = llvm::dyn_cast<llvm::ValueAsMetadata>(M)) {
incorporateValue(V->getValue());
} else {
// Some unknown Metadata subclass - has LLVM introduced something new?
llvm_unreachable("Unknown Metadata subclass");
}
}
#endif
};
} // end anonymous namespace
static void findUsedArrayAndLongIntTypes(const llvm::Module *m, std::vector<llvm::ArrayType*> &t,
std::vector<llvm::IntegerType*> &i, std::vector<bool> &IsVolatile,
std::vector<int> &Alignment) {
TypeFinder(t, i, IsVolatile, Alignment).run(*m);
}
static bool is_vec16_i64_ty(llvm::Type *Ty) {
llvm::VectorType *VTy = llvm::dyn_cast<llvm::VectorType>(Ty);
if ((VTy != NULL) && (VTy->getElementType()->isIntegerTy()) &&
VTy->getElementType()->getPrimitiveSizeInBits() == 64)
return true;
return false;
}
namespace {
class CBEMCAsmInfo : public llvm::MCAsmInfo {
public:
CBEMCAsmInfo() {
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_4 // 3.2, 3.3, 3.4
GlobalPrefix = "";
#endif
PrivateGlobalPrefix = "";
}
};
/// CWriter - This class is the main chunk of code that converts an LLVM
/// module to a C translation unit.
class CWriter : public llvm::FunctionPass, public llvm::InstVisitor<CWriter> {
llvm::formatted_raw_ostream &Out;
llvm::IntrinsicLowering *IL;
//llvm::Mangler *Mang;
llvm::LoopInfo *LI;
const llvm::Module *TheModule;
const llvm::MCAsmInfo* TAsm;
const llvm::MCRegisterInfo *MRI;
const llvm::MCObjectFileInfo *MOFI;
llvm::MCContext *TCtx;
// FIXME: it's ugly to have the name be "TD" here, but it saves us
// lots of ifdefs in the below since the new DataLayout and the old
// TargetData have generally similar interfaces...
const llvm::DataLayout* TD;
std::map<const llvm::ConstantFP *, unsigned> FPConstantMap;
std::map<const llvm::ConstantDataVector *, unsigned> VectorConstantMap;
unsigned VectorConstantIndex;
std::set<llvm::Function*> intrinsicPrototypesAlreadyGenerated;
std::set<const llvm::Argument*> ByValParams;
unsigned FPCounter;
unsigned OpaqueCounter;
llvm::DenseMap<const llvm::Value*, unsigned> AnonValueNumbers;
unsigned NextAnonValueNumber;
std::string includeName;
int vectorWidth;
/// UnnamedStructIDs - This contains a unique ID for each struct that is
/// either anonymous or has no name.
llvm::DenseMap<llvm::StructType*, unsigned> UnnamedStructIDs;
llvm::DenseMap<llvm::ArrayType *, unsigned> ArrayIDs;
public:
static char ID;
explicit CWriter(llvm::formatted_raw_ostream &o, const char *incname,
int vecwidth)
: FunctionPass(ID), Out(o), IL(0), /* Mang(0), */ LI(0),
TheModule(0), TAsm(0), MRI(0), MOFI(0), TCtx(0), TD(0),
OpaqueCounter(0), NextAnonValueNumber(0),
includeName(incname ? incname : "generic_defs.h"),
vectorWidth(vecwidth) {
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_6 // <= 3.6
initializeLoopInfoPass(*llvm::PassRegistry::getPassRegistry());
#else // LLVM 3.7+
initializeLoopInfoWrapperPassPass(*llvm::PassRegistry::getPassRegistry());
#endif
FPCounter = 0;
VectorConstantIndex = 0;
}
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_9 // <= 3.9
virtual const char *getPassName() const { return "C backend"; }
#else // LLVM 4.0+
virtual llvm::StringRef getPassName() const { return "C backend"; }
#endif
void getAnalysisUsage(llvm::AnalysisUsage &AU) const {
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_6 // <= 3.6
AU.addRequired<llvm::LoopInfo>();
#else // LLVM 3.7+
AU.addRequired<llvm::LoopInfoWrapperPass>();
#endif
AU.setPreservesAll();
}
virtual bool doInitialization(llvm::Module &M);
bool runOnFunction(llvm::Function &F) {
// Do not codegen any 'available_externally' functions at all, they have
// definitions outside the translation unit.
if (F.hasAvailableExternallyLinkage())
return false;
#if ISPC_LLVM_VERSION <= ISPC_LLVM_3_6 // <= 3.6
LI = &getAnalysis<llvm::LoopInfo>();
#else // LLVM 3.7+
LI = &getAnalysis<llvm::LoopInfoWrapperPass>().getLoopInfo();
#endif
// Get rid of intrinsics we can't handle.
lowerIntrinsics(F);
// Output all floating point constants that cannot be printed accurately.
printFloatingPointConstants(F);
// Output all vector constants so they can be accessed with single
// vector loads
printVectorConstants(F);
printFunction(F);
return false;
}
virtual bool doFinalization(llvm::Module &M) {
// Free memory...
delete IL;
delete TD;
//delete Mang;
delete TCtx;
delete TAsm;
delete MRI;
delete MOFI;
FPConstantMap.clear();
VectorConstantMap.clear();
ByValParams.clear();
intrinsicPrototypesAlreadyGenerated.clear();
UnnamedStructIDs.clear();
ArrayIDs.clear();
return false;
}
llvm::raw_ostream &printType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned = false,
const std::string &VariableName = "",
bool IgnoreName = false,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
const llvm::AttrListPtr &PAL = llvm::AttrListPtr()
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
const llvm::AttributeSet &PAL = llvm::AttributeSet()
#else // LLVM 5.0+
const llvm::AttributeList &PAL = llvm::AttributeList()
#endif
);
llvm::raw_ostream &printSimpleType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned,
const std::string &NameSoFar = "");
void printStructReturnPointerFunctionType(llvm::raw_ostream &Out,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
const llvm::AttrListPtr &PAL,
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
const llvm::AttributeSet &PAL,
#else // LLVM 5.0+
const llvm::AttributeList &PAL,
#endif
llvm::PointerType *Ty);
std::string getStructName(llvm::StructType *ST);
std::string getArrayName(llvm::ArrayType *AT);
/// writeOperandDeref - Print the result of dereferencing the specified
/// operand with '*'. This is equivalent to printing '*' then using
/// writeOperand, but avoids excess syntax in some cases.
void writeOperandDeref(llvm::Value *Operand) {
if (isAddressExposed(Operand)) {
// Already something with an address exposed.
writeOperandInternal(Operand);
} else {
Out << "*(";
writeOperand(Operand);
Out << ")";
}
}
void writeOperand(llvm::Value *Operand, bool Static = false);
void writeInstComputationInline(llvm::Instruction &I);
void writeOperandInternal(llvm::Value *Operand, bool Static = false);
void writeOperandWithCast(llvm::Value* Operand, unsigned Opcode);
void writeOperandWithCast(llvm::Value* Operand, const llvm::ICmpInst &I);
bool writeInstructionCast(const llvm::Instruction &I);
void writeMemoryAccess(llvm::Value *Operand, llvm::Type *OperandType,
bool IsVolatile, unsigned Alignment);
private :
void lowerIntrinsics(llvm::Function &F);
/// Prints the definition of the intrinsic function F. Supports the
/// intrinsics which need to be explicitly defined in the CBackend.
void printIntrinsicDefinition(const llvm::Function &F, llvm::raw_ostream &Out);
void printModuleTypes();
void printContainedStructs(llvm::Type *Ty, llvm::SmallPtrSet<llvm::Type *, 16> &);
void printContainedArrays(llvm::ArrayType *ATy, llvm::SmallPtrSet<llvm::Type *, 16> &);
void printFloatingPointConstants(llvm::Function &F);
void printFloatingPointConstants(const llvm::Constant *C);
void printVectorConstants(llvm::Function &F);
void printFunctionSignature(const llvm::Function *F, bool Prototype);
void printFunction(llvm::Function &);
void printBasicBlock(llvm::BasicBlock *BB);
void printLoop(llvm::Loop *L);
bool printCast(unsigned opcode, llvm::Type *SrcTy, llvm::Type *DstTy);
void printConstant(llvm::Constant *CPV, bool Static);
void printConstantWithCast(llvm::Constant *CPV, unsigned Opcode);
bool printConstExprCast(const llvm::ConstantExpr *CE, bool Static);
void printConstantArray(llvm::ConstantArray *CPA, bool Static);
void printConstantVector(llvm::ConstantVector *CV, bool Static);
void printConstantDataSequential(llvm::ConstantDataSequential *CDS, bool Static);
/// isAddressExposed - Return true if the specified value's name needs to
/// have its address taken in order to get a C value of the correct type.
/// This happens for global variables, byval parameters, and direct allocas.
bool isAddressExposed(const llvm::Value *V) const {
if (const llvm::Argument *A = llvm::dyn_cast<llvm::Argument>(V))
return ByValParams.count(A);
return llvm::isa<llvm::GlobalVariable>(V) || isDirectAlloca(V);
}
// isInlinableInst - Attempt to inline instructions into their uses to build
// trees as much as possible. To do this, we have to consistently decide
// what is acceptable to inline, so that variable declarations don't get
// printed and an extra copy of the expr is not emitted.
//
static bool isInlinableInst(const llvm::Instruction &I) {
// Always inline cmp instructions, even if they are shared by multiple
// expressions. GCC generates horrible code if we don't.
if (llvm::isa<llvm::CmpInst>(I) && llvm::isa<llvm::VectorType>(I.getType()) == false)
return true;
#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_5 // 3.5+
// This instruction returns a struct on LLVM older than 3.4, and can not be inlined
if (llvm::isa<llvm::AtomicCmpXchgInst>(I))
return false;
#endif
// Must be an expression, must be used exactly once. If it is dead, we
// emit it inline where it would go.
if (I.getType() == llvm::Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
llvm::isa<llvm::TerminatorInst>(I) || llvm::isa<llvm::CallInst>(I) || llvm::isa<llvm::PHINode>(I) ||
llvm::isa<llvm::LoadInst>(I) || llvm::isa<llvm::VAArgInst>(I) || llvm::isa<llvm::InsertElementInst>(I) ||
llvm::isa<llvm::InsertValueInst>(I) || llvm::isa<llvm::ExtractValueInst>(I) || llvm::isa<llvm::SelectInst>(I))
// Don't inline a load across a store or other bad things!
return false;
// Must not be used in inline asm, extractelement, or shufflevector.
if (I.hasOneUse()) {
#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_5 // 3.5+
const llvm::Instruction &User = llvm::cast<llvm::Instruction>(*I.user_back());
#else
const llvm::Instruction &User = llvm::cast<llvm::Instruction>(*I.use_back());
#endif
if (isInlineAsm(User) || llvm::isa<llvm::ExtractElementInst>(User) ||
llvm::isa<llvm::ShuffleVectorInst>(User) || llvm::isa<llvm::AtomicRMWInst>(User) ||
llvm::isa<llvm::AtomicCmpXchgInst>(User))
return false;
}
// Only inline instruction it if it's use is in the same BB as the inst.
#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_5 // 3.5+
return I.getParent() == llvm::cast<llvm::Instruction>(I.user_back())->getParent();
#else
return I.getParent() == llvm::cast<llvm::Instruction>(I.use_back())->getParent();
#endif
}
// isDirectAlloca - Define fixed sized allocas in the entry block as direct
// variables which are accessed with the & operator. This causes GCC to
// generate significantly better code than to emit alloca calls directly.
//
static const llvm::AllocaInst *isDirectAlloca(const llvm::Value *V) {
const llvm::AllocaInst *AI = llvm::dyn_cast<llvm::AllocaInst>(V);
if (!AI) return 0;
if (AI->isArrayAllocation())
return 0; // FIXME: we can also inline fixed size array allocas!
if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
return 0;
return AI;
}
// isInlineAsm - Check if the instruction is a call to an inline asm chunk.
static bool isInlineAsm(const llvm::Instruction& I) {
if (const llvm::CallInst *CI = llvm::dyn_cast<llvm::CallInst>(&I))
return llvm::isa<llvm::InlineAsm>(CI->getCalledValue());
return false;
}
// Instruction visitation functions
friend class llvm::InstVisitor<CWriter>;
void visitReturnInst(llvm::ReturnInst &I);
void visitBranchInst(llvm::BranchInst &I);
void visitSwitchInst(llvm::SwitchInst &I);
void visitIndirectBrInst(llvm::IndirectBrInst &I);
void visitInvokeInst(llvm::InvokeInst &I) {
llvm_unreachable("Lowerinvoke pass didn't work!");
}
void visitResumeInst(llvm::ResumeInst &I) {
llvm_unreachable("DwarfEHPrepare pass didn't work!");
}
void visitUnreachableInst(llvm::UnreachableInst &I);
void visitPHINode(llvm::PHINode &I);
void visitBinaryOperator(llvm::Instruction &I);
void visitICmpInst(llvm::ICmpInst &I);
void visitFCmpInst(llvm::FCmpInst &I);
void visitCastInst (llvm::CastInst &I);
void visitSelectInst(llvm::SelectInst &I);
void visitCallInst (llvm::CallInst &I);
void visitInlineAsm(llvm::CallInst &I);
bool visitBuiltinCall(llvm::CallInst &I, llvm::Intrinsic::ID ID, bool &WroteCallee);
void visitAllocaInst(llvm::AllocaInst &I);
void visitLoadInst (llvm::LoadInst &I);
void visitStoreInst (llvm::StoreInst &I);
void visitGetElementPtrInst(llvm::GetElementPtrInst &I);
void visitVAArgInst (llvm::VAArgInst &I);
void visitInsertElementInst(llvm::InsertElementInst &I);
void visitExtractElementInst(llvm::ExtractElementInst &I);
void visitShuffleVectorInst(llvm::ShuffleVectorInst &SVI);
void visitInsertValueInst(llvm::InsertValueInst &I);
void visitExtractValueInst(llvm::ExtractValueInst &I);
void visitAtomicRMWInst(llvm::AtomicRMWInst &I);
void visitAtomicCmpXchgInst(llvm::AtomicCmpXchgInst &I);
void visitInstruction(llvm::Instruction &I) {
#ifndef NDEBUG
llvm::errs() << "C Writer does not know about " << I;
#endif
llvm_unreachable(0);
}
void outputLValue(llvm::Instruction *I) {
Out << " " << GetValueName(I) << " = ";
}
bool isGotoCodeNecessary(llvm::BasicBlock *From, llvm::BasicBlock *To);
void printPHICopiesForSuccessor(llvm::BasicBlock *CurBlock,
llvm::BasicBlock *Successor, unsigned Indent);
void printBranchToBlock(llvm::BasicBlock *CurBlock, llvm::BasicBlock *SuccBlock,
unsigned Indent);
void printGEPExpression(llvm::Value *Ptr, llvm::gep_type_iterator I,
llvm::gep_type_iterator E, bool Static);
std::string GetValueName(const llvm::Value *Operand);
};
}
char CWriter::ID = 0;
static std::string CBEMangle(const std::string &S) {
std::string Result;
for (unsigned i = 0, e = S.size(); i != e; ++i) {
if (i+1 != e && ((S[i] == '>' && S[i+1] == '>') ||
(S[i] == '<' && S[i+1] == '<'))) {
Result += '_';
Result += 'A'+(S[i]&15);
Result += 'A'+((S[i]>>4)&15);
Result += '_';
i++;
} else if (isalnum(S[i]) || S[i] == '_' || S[i] == '<' || S[i] == '>') {
Result += S[i];
} else {
Result += '_';
Result += 'A'+(S[i]&15);
Result += 'A'+((S[i]>>4)&15);
Result += '_';
}
}
return Result;
}
std::string CWriter::getStructName(llvm::StructType *ST) {
if (!ST->isLiteral() && !ST->getName().empty())
return CBEMangle("l_"+ST->getName().str());
return "l_unnamed_" + llvm::utostr(UnnamedStructIDs[ST]);
}
std::string CWriter::getArrayName(llvm::ArrayType *AT) {
return "l_array_" + llvm::utostr(ArrayIDs[AT]);
}
/// printStructReturnPointerFunctionType - This is like printType for a struct
/// return type, except, instead of printing the type as void (*)(Struct*, ...)
/// print it as "Struct (*)(...)", for struct return functions.
void CWriter::printStructReturnPointerFunctionType(llvm::raw_ostream &Out,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
const llvm::AttrListPtr &PAL,
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
const llvm::AttributeSet &PAL,
#else // LLVM 5.0+
const llvm::AttributeList &PAL,
#endif
llvm::PointerType *TheTy) {
llvm::FunctionType *FTy = llvm::cast<llvm::FunctionType>(TheTy->getElementType());
std::string tstr;
llvm::raw_string_ostream FunctionInnards(tstr);
FunctionInnards << " (*) (";
bool PrintedType = false;
llvm::FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
llvm::Type *RetTy = llvm::cast<llvm::PointerType>(*I)->getElementType();
unsigned Idx = 1;
for (++I, ++Idx; I != E; ++I, ++Idx) {
if (PrintedType)
FunctionInnards << ", ";
llvm::Type *ArgTy = *I;
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::ByVal)) {
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::AttributeSet::FunctionIndex, llvm::Attribute::ByVal)) {
#else // LLVM 5.0+
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attribute::ByVal)) {
#endif
assert(ArgTy->isPointerTy());
ArgTy = llvm::cast<llvm::PointerType>(ArgTy)->getElementType();
}
printType(FunctionInnards, ArgTy,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::SExt),
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
PAL.getParamAttributes(Idx).hasAttribute(llvm::AttributeSet::FunctionIndex, llvm::Attribute::SExt),
#else // LLVM 5.0+
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attribute::SExt),
#endif
"");
PrintedType = true;
}
if (FTy->isVarArg()) {
if (!PrintedType)
FunctionInnards << " int"; //dummy argument for empty vararg functs
FunctionInnards << ", ...";
} else if (!PrintedType) {
FunctionInnards << "void";
}
FunctionInnards << ')';
printType(Out, RetTy,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
PAL.getParamAttributes(0).hasAttribute(llvm::Attributes::SExt),
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
PAL.getParamAttributes(0).hasAttribute(llvm::AttributeSet::ReturnIndex, llvm::Attribute::SExt),
#else // LLVM 5.0+
PAL.getParamAttributes(0).hasAttribute(llvm::Attribute::SExt),
#endif
FunctionInnards.str());
}
llvm::raw_ostream &
CWriter::printSimpleType(llvm::raw_ostream &Out, llvm::Type *Ty, bool isSigned,
const std::string &NameSoFar) {
assert((Ty->isFloatingPointTy() || Ty->isX86_MMXTy() || Ty->isIntegerTy() || Ty->isVectorTy() || Ty->isVoidTy()) &&
"Invalid type for printSimpleType");
switch (Ty->getTypeID()) {
case llvm::Type::VoidTyID: return Out << "void " << NameSoFar;
case llvm::Type::IntegerTyID: {
unsigned NumBits = llvm::cast<llvm::IntegerType>(Ty)->getBitWidth();
if (NumBits == 1)
return Out << "bool " << NameSoFar;
else if (NumBits <= 8)
return Out << (isSigned?"":"u") << "int8_t " << NameSoFar;
else if (NumBits <= 16)
return Out << (isSigned?"":"u") << "int16_t " << NameSoFar;
else if (NumBits <= 32)
return Out << (isSigned?"":"u") << "int32_t " << NameSoFar;
else if (NumBits <= 64)
return Out << (isSigned?"":"u") << "int64_t "<< NameSoFar;
else
return Out << "iN<" << NumBits << "> " << NameSoFar;
}
case llvm::Type::FloatTyID: return Out << "float " << NameSoFar;
case llvm::Type::DoubleTyID: return Out << "double " << NameSoFar;
// Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
// present matches host 'long double'.
case llvm::Type::X86_FP80TyID:
case llvm::Type::PPC_FP128TyID:
case llvm::Type::FP128TyID: return Out << "long double " << NameSoFar;
case llvm::Type::X86_MMXTyID:
return printSimpleType(Out, llvm::Type::getInt32Ty(Ty->getContext()), isSigned,
" __attribute__((vector_size(64))) " + NameSoFar);
case llvm::Type::VectorTyID: {
llvm::VectorType *VTy = llvm::cast<llvm::VectorType>(Ty);
#if 1
const char *suffix = NULL;
const llvm::Type *eltTy = VTy->getElementType();
if (eltTy->isFloatTy())
suffix = "f";
else if (eltTy->isDoubleTy())
suffix = "d";
else {
assert(eltTy->isIntegerTy());
switch (eltTy->getPrimitiveSizeInBits()) {
case 1:
suffix = "i1";
break;
case 8:
suffix = "i8";
break;
case 16:
suffix = "i16";
break;
case 32:
suffix = "i32";
break;
case 64:
suffix = "i64";
break;
default:
suffix = "iN";
break;
}
}
return Out << "__vec" << VTy->getNumElements() << "_" << suffix << " " <<
NameSoFar;
#else
return printSimpleType(Out, VTy->getElementType(), isSigned,
" __attribute__((vector_size(" +
utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
#endif
}
default:
#ifndef NDEBUG
llvm::errs() << "Unknown primitive type: " << *Ty << "\n";
#endif
llvm_unreachable(0);
}
}
// Pass the Type* and the variable name and this prints out the variable
// declaration.
//
llvm::raw_ostream &CWriter::printType(llvm::raw_ostream &Out, llvm::Type *Ty,
bool isSigned, const std::string &NameSoFar,
bool IgnoreName,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
const llvm::AttrListPtr &PAL
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
const llvm::AttributeSet &PAL
#else // LLVM 5.0+
const llvm::AttributeList &PAL
#endif
) {
if (Ty->isFloatingPointTy() || Ty->isX86_MMXTy() || Ty->isIntegerTy() || Ty->isVectorTy() || Ty->isVoidTy()) {
printSimpleType(Out, Ty, isSigned, NameSoFar);
return Out;
}
switch (Ty->getTypeID()) {
case llvm::Type::FunctionTyID: {
llvm::FunctionType *FTy = llvm::cast<llvm::FunctionType>(Ty);
std::string tstr;
llvm::raw_string_ostream FunctionInnards(tstr);
FunctionInnards << " (" << NameSoFar << ") (";
unsigned Idx = 1;
for (llvm::FunctionType::param_iterator I = FTy->param_begin(),
E = FTy->param_end(); I != E; ++I) {
llvm::Type *ArgTy = *I;
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::ByVal)) {
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::AttributeSet::FunctionIndex, llvm::Attribute::ByVal)) {
#else // LLVM 5.0+
if (PAL.getParamAttributes(Idx).hasAttribute(llvm::Attribute::ByVal)) {
#endif
assert(ArgTy->isPointerTy());
ArgTy = llvm::cast<llvm::PointerType>(ArgTy)->getElementType();
}
if (I != FTy->param_begin())
FunctionInnards << ", ";
printType(FunctionInnards, ArgTy,
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attributes::SExt),
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0
PAL.getParamAttributes(Idx).hasAttribute(llvm::AttributeSet::FunctionIndex, llvm::Attribute::SExt),
#else // LLVM 5.0+
PAL.getParamAttributes(Idx).hasAttribute(llvm::Attribute::SExt),
#endif
"");
++Idx;
}
if (FTy->isVarArg()) {
if (!FTy->getNumParams())
FunctionInnards << " int"; //dummy argument for empty vaarg functs
FunctionInnards << ", ...";
} else if (!FTy->getNumParams()) {
FunctionInnards << "void";
}
FunctionInnards << ')';
printType(Out, FTy->getReturnType(),
#if ISPC_LLVM_VERSION == ISPC_LLVM_3_2
PAL.getParamAttributes(0).hasAttribute(llvm::Attributes::SExt),
#elif ISPC_LLVM_VERSION <= ISPC_LLVM_4_0